Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f968d764367d23f…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 09:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 165c95639ec70e6124c5bd06afc57af6 SHA-1: 716475da1f9cfc660d2b5eed9c6f8c96ce3c4b50 SHA-256: 1f968d764367d23fab309b44da0d3087f07aba61440db6837fd8508df38dd2c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including one hosted on compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage trusted infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.barbazan-debat.fr/ckfinder/userfiles/files/55522717005.pdf
    • http://hanedantoptan.com/upload/files/lunogod.pdf
    • https://hoangvan.vn/wp-content/uploads/files/dosojapajinurojaxefod.pdf
    • https://mehfermobilsaglik.com/userfiles/file/55845278876.pdf
    • http://receptlap.hu/files/jibetevelozeresuvolinedid.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/36335622420.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/39986360098.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/457421d02ad0e6d1ab075fdd180a611d/89102219880.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16979622594.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7139dbc38---sopozudosumagep.pdf
    • http://movitecnic.com/ressource/site-image/files/zilaperigumatufotebumusal.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/jefejuxoviwobag.pdf
    • http://rjbmachinery.com/d/files/datidazagarinetedupibuxa.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/24779348496.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/85557883026.pdf
    • http://regmac.net/userfiles/files/67913294989.pdf
    • http://kemenyseprosiklos.hu/upload/file/6483511327.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/tunadefufupalozasibet.pdf
    • https://glycocalyx.nl/userfiles/image/file/93579959099.pdf
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/sutunaj.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb7728c8---lagusid.pdf
    • https://orrizon.ru/images/file/kogajuwuselagatixugidese.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146514bd12a9---kuvorudanemelusufemexukep.pdf
    • https://bor-diing.com/upload/files/85539851662.pdf
    • http://abwingsjanaf.com/uploads/files/86492247864.pdf
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/29719124890.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7a1b0phh0eedgbo7r8f2g3jdcn/taguwokovu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+answer+an+interview+question+about+your+weaknesses
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b699.bin
840acc996cd9dba04cda28e75fcb437b32e619b622b5f5249c243ccb215eb829
pdf-font-stream PDF embedded font (sfnt) at offset 0xB699 10792 bytes
font_01_sfnt_off0000cfa5.bin
cb2feb36db248ddf56339d28d57c37eaf773f3524153b05b8b7f7e86d9d92dbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA5 15316 bytes
font_02_sfnt_off0000f61b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16792 bytes